219 
remarkable Effects of a Shipivreck. 
delicacy of frame, struck w ith madness, lie all night on a cold 
floor, with hardly the covering that decency requires, when 
the water was frozen on the table by her, and the milk that 
she was to feed on was a mass of ice. 
7th. There are particular conditions of the atmosphere, not 
perfectly understood, that seem to have an influence in de- 
priving us more speedily of our animal heat, than others where 
the cold is greater. 
It may seem that by this time I had renounced my inten- 
tion of trying the effects of immersion in fresh water on the 
animal powers, and particularly on the heat. Some trials 
I have, however, made, of which I shall only relate the fol- 
lowing. 
EXPERIMENT X. 
In the same vessel, containing an equal bulk of fresh water, 
Richard Edwards, the subject of my first experiments, was 
immersed, at the same hour of the day His heat previously 
was 98°, his pulse beat 92 in the minute : the heat of the air 
was 4,i 0 y, that of the water 40°. The wind was now in the 
west, so that in the court where the bath stood there was a 
perfect calm. As I had some fears of the issue of this experi- 
ment, instead of exposing him for a minute naked to the wind 
before immersion, he was covered with a flannel dress from the 
air till the instant he descended into the water, into which he 
was suffered to sink himself slowly, with the bulb of the ther- 
mometer under his tongue. These are important circum- 
stances. The following table exhibits the result. 
